* {
    margin: 0;
    padding: 0;
}
.header{
    position: fixed;
    top: 0px;
    width: 100%;
    height: 88px;
    background-color: #5fc0cd;
    display: flex;
    justify-content: center;
    align-items: center;
    .header1 {
        width: 140px;
        height: 70px;
        font-family: "SimHei";
        font-size: 32px;
        color:  white;
        outline: none;
        cursor: pointer;
        background-color: #55a8b3;
        border: none;
        border-radius: 10px;
    }
    .header2 {
        width: 140px;
        height: 70px;
        font-family: "SimHei";
        font-size: 32px;
        color:  #5fc0cd;
        outline: none;
        cursor: pointer;
        background-color: white;
        border: none;
        border-radius: 10px;
        a:link {
            color: #5fc0cd;
            text-decoration: none;
        }
}
.header3 {
    position: fixed;
    top: 22px;
    right: 2vw;
    background-color: transparent;
    border-style: none;
    outline: none;
    cursor: pointer;
}
.footer {
    position: fixed;
    bottom: 0px;
    width: 100%;
    height: 100px;
    background-color: #f8fafb;
    border-top: 1px solid #e2eaec;
    display: flex;
    justify-content: center;
    align-items: center;
    span {
        display: inline-block;
        width: 46px;
        height: 40px;
        border: none;
        background-image: url(img/sprites.png);
    }
    .footer1 {
        font-size: 16px;
        color: #5fc0cd;
        background-color: transparent;
        border-style: none;
        outline: none;
        cursor: pointer;
        margin-right: 10%;
        .a1 {
            background-position: 0 -110px; 
        }
    }
    .footer2 {
        font-size: 16px;
        color: #999999;
        background-color: transparent;
        border-style: none;
        outline: none;
        cursor: pointer;
        margin-left: 10%;
        .a2 {
            background-position: -48px -110px;
        }
    }
    .footer3 {
        background-color: transparent;
        border-style: none;
        outline: none;
        cursor: pointer;
    }
}
#nav {
    position: fixed;
    top: 88px;
    width: 100%;
    height: 80px;
    font-size: 28px;
    color: #999999;
    border-bottom: 1px solid #e2eaec;
    display: flex;
    list-style: none;
    li {
        margin: 21.5px auto;
    }
    :hover li {
        display: block;
    }
    li ul li {
        display: none;
    }
}
.main {
    position: fixed;
    top: 168px;
    bottom: 100px;
    width: 100%;
    overflow: auto;
    color: #999999;
    span {
        display: inline-block;
        width: 24px;
        height: 24px;
        border: none;
        background-image: url(img/sprites.png);
        vertical-align: middle;
    }
    .a3 {
        background-position: 0 0;
    }
    .a4 {
        background-position: -25px 0;
    }
    .box1 {
        height: 50px;
        float: left;
        clear: both;
        line-height: 50px;
    }
    .box2 {
        height: 50px;
        color: black;
        float: left;
        clear: both;
        line-height: 50px;
    }
    .box3 {
        height: 50px;
        float: left;
        clear: both;
        line-height: 50px;
    }
    .price {
        float: right;
        color: red;
        font-size: 24px;
        line-height: 50px;    
    }
    #main {
      
        height: 150px;
        border-bottom: 1px #e2eaec solid;
        padding: 0 20px 0 20px;
    }
}